期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 1, 页码 784-791出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b17279
关键词
composite polymer electrolyte; ionic conductivity; space charge region; phase-field simulation; percolation; Monte Carlo simulation
资金
- National Natural Science Foundation of China [51672096]
- State Key Laboratory of Solidification Processing in NWPU [SKLSP201710]
By dispersing Li6.25Ga0.25La3Zr2O12 (Ga-LLZO) nanoparticles in poly(ethylene oxide) (PEO) matrix, PEO:Ga-LLZO composite polymer electro-Space charge region lytes are synthesized. The PEO: Ga-LLZO composite with 16 vol % Ga-LLZO nanoparticles shows a conductivity of 7.2 x 10(-5) S cm(-1) at 30 degrees C, about 4 orders of magnitude higher than the conductivity of PEO. The enhancement of the ionic conductivity is closely related to the space charge region (similar to 3 nm) formed at the interface between the PEO matrix and the Ga-LLZO nanoparticles. The space charge region is observed by transmission electron microscope (TEM) and corroborated by the phase-field simulation. Using the random resistor model, the lithium-ion transport in the composite polymer electrolyte is simulated by the Monte Carlo simulation, demonstrating that the enhanced ionic conductivity can be ascribed to the ionic conduction in the space charge regions and the percolation of the space charge regions.
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